import buildURL from '../helpers/buildURL'
import buildFullPath from '../core/buildFullPath'
import settle from '../core/settle'
import {isUndefined} from '../utils'

/**
 * 返回可选值存在的配置
 * @param {Array} keys - 可选值数组
 * @param {Object} config2 - 配置
 * @return {{}} - 存在的配置项
 */
const mergeKeys = (keys, config2) => {
  const config = {}
  keys.forEach((prop) => {
    if (!isUndefined(config2[prop])) {
      config[prop] = config2[prop]
    }
  })
  return config
}
export default (config) => new Promise((resolve, reject) => {
  const fullPath = buildURL(buildFullPath(config.baseURL, config.url), config.params)
  const _config = {
    url: fullPath,
    header: config.header,
    complete: (response) => {
      config.fullPath = fullPath
      response.config = config
      try {
        // 对可能字符串不是json 的情况容错
        if (typeof response.data === 'string') {
          response.data = JSON.parse(response.data)
        }
        // eslint-disable-next-line no-empty
      } catch (e) {
      }
      settle(resolve, reject, response)
    }
  }
  let requestTask
  if (config.method === 'UPLOAD') {
    delete _config.header['content-type']
    delete _config.header['Content-Type']
    const otherConfig = {
      // #ifdef MP-ALIPAY
      fileType: config.fileType,
      // #endif
      filePath: config.filePath,
      name: config.name
    }
    const optionalKeys = [
      // #ifdef APP-PLUS || H5
      'files',
      // #endif
      // #ifdef H5
      'file',
      // #endif
      // #ifdef H5 || APP-PLUS
      'timeout',
      // #endif
      'formData'
    ]
    requestTask = uni.uploadFile({..._config, ...otherConfig, ...mergeKeys(optionalKeys, config)})
  } else if (config.method === 'DOWNLOAD') {
    // #ifdef H5 || APP-PLUS
    if (!isUndefined(config.timeout)) {
      _config.timeout = config.timeout
    }
    // #endif
    requestTask = uni.downloadFile(_config)
  } else {
    const optionalKeys = [
      'data',
      'method',
      // #ifdef H5 || APP-PLUS || MP-ALIPAY || MP-WEIXIN
      'timeout',
      // #endif
      'dataType',
      // #ifndef MP-ALIPAY
      'responseType',
      // #endif
      // #ifdef APP-PLUS
      'sslVerify',
      // #endif
      // #ifdef H5
      'withCredentials',
      // #endif
      // #ifdef APP-PLUS
      'firstIpv4'
      // #endif
    ]
    requestTask = uni.request({..._config, ...mergeKeys(optionalKeys, config)})
  }
  if (config.getTask) {
    config.getTask(requestTask, config)
  }
})
